– The steel trimmer head that slices through tough grass, branches, and weeds with incredible ease. – Blades are constructed from high-grade steel alloy for ultra hardness, sharpness and extra durability. – 360° blades for full coverage cutting with no dead spots. – Universal head fits all trimmer models. – Easy to install, simply screw the head onto the trimmer unit. – Mounting hold diameter: 25.4 mm (1″ in) – Diameter: 15 cm (5.9″ in)